Date   : Fri, 24 Feb 2006 01:33:31 +0000
From   : "Thomas Horsten" <thomas.horsten@...>
Subject: Beeb ROMS

Hi,

I have a few Beeb ROMS in my collection, one of them is an INTER WORD
original, which has a blue label and a funny construction. It consists
of a socket with a small PCB, on the PCB is mounted a smallish IC and
some of the pins from the socket is connected to it, then the "real"
ROM is sitting on another socket on top of that.

I'm curious about it - is it some kind of copy protection, and if so
how does it work? Or is it an adapter they made so a larger ROM can be
used in a 16k slot, with some sort of bank switching?

I've bought an EPROM burner and UV eraser from eBay, so I can now burn
my own ROM's, if anyone on the list needs something burned I'll gladly
to do it for free if you send me the chip and SAE, or for the cost of
postage and the chip (I have a few spare 27128's).

Also I managed to build an EEPROM adapter for the Master 128 from
Maplin components, using (slightly modified) instructions from
http://www.adsb.co.uk/bbc/adaptor.html, at a total price of less than
£10 including the EEPROM, I'll be happy to mail the details and burn a
(Y2K fixed) ROM if you need it.

And to make my collection complete (and be able to test my secret
project on a 3.50), I'd like to get my hands on a 3.50 MOS, so if
someone has an image (or can make one with Andrew Benham's BASIC
program, see link above), I'd really like a copy.

Thomas